CN103236706A - Battery energy storage system based on modular multilevel AC-AC (Alternating Current-Alternating Current) converter topology - Google Patents

Battery energy storage system based on modular multilevel AC-AC (Alternating Current-Alternating Current) converter topology Download PDF

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CN103236706A
CN103236706A CN 201310144367 CN201310144367A CN103236706A CN 103236706 A CN103236706 A CN 103236706A CN 201310144367 CN201310144367 CN 201310144367 CN 201310144367 A CN201310144367 A CN 201310144367A CN 103236706 A CN103236706 A CN 103236706A
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single
switch
ac
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CN103236706B (en )
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殷正刚
唐西胜
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中国科学院电工研究所
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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    • Y02E40/10Flexible AC transmission systems [FACTS]

Abstract

The invention relates to a battery energy storage system based on a modular multilevel AC-AC (Alternating Current-Alternating Current) converter topology. The battery energy storage system comprises a modular multilevel three-phase AC/single-phase AC converter (1), a single-phase high-frequency insulating transformer (2), a single-phase rectifier (3) and an energy storage battery pack (4), wherein the three-phase input side of the modular multilevel three-phase AC/single-phase AC converter (1) is connected with a power grid, the single-phase AC output end of the modular multilevel three-phase AC/single-phase AC converter (1) is connected with the primary side of the single-phase high-frequency insulating transformer (2), the secondary side of the single-phase high-frequency insulating transformer (2) is connected with the single-phase rectifier (3), and the DC (Direct Current) side of the single-phase rectifier (3) is connected with the energy storage battery pack (4).

Description

基于模块化多电平交交变换拓扑的电池储能系统 Cycloconverter conversion topology of the battery energy storage system based on multi-level modular

技术领域 FIELD

[0001] 本发明涉及一种应用于中压电力系统的电池储能系统。 [0001] The present invention relates to a power system battery energy storage system is applied to the intermediate pressure.

背景技术 Background technique

[0002]目前,随着新能源发电并网容量的不断加大,新能源本身存在的间歇性、波动性对电网稳定性的影响越来越大,为了平抑新能源发电的功率波动,一种可行的解决方案是加入储能系统。 [0002] Now, with the new energy power generation and network capacity continues to increase, new energy inherent in intermittent, the volatility of the increasing grid stability, in order to stabilize power fluctuations new energy power generation of a feasible solution is to add energy storage system.

[0003] 在低压电网领域,由于电力电子开关器件耐压充足以及结构简单等优点,储能系统通常采用两电平拓扑。 [0003] In the field of low-voltage network, since the sufficient voltage and power electronic switching devices and simple structure, energy storage systems typically use two-level topology. 在中高压电网,受制于当前电力电子器件耐压性能的限制,无法直接采用三相两电平拓扑。 In the high-voltage network, subject to the limitations of current pressure resistance of power electronic devices, not directly from a three-phase two-level topology. 为输出高电压有两种策略,一种是将两电平低压变流器和升压变压器组合使用;另一种则使用高压变流器直接并网。 A high voltage output, there are two strategies, one is a two-level converter and a low pressure in combination of step-up transformer; other uses a direct current high voltage power grid. 前一种方案由于引入了升压变压器增加了系统的成本、体积和重量,且为实现大功率转换常需要多台低压变流器并联运行,效率较低;后一种方案则较好地克服了上述缺点。 Since a solution before introduction of the boosting transformer increases the cost, size and weight of the system, and is often necessary to achieve high power conversion multiple parallel low-voltage operation of the converter, the efficiency is low; the latter embodiment is preferred overcome the above-mentioned drawbacks.

[0004]目前已有的中高压储能变流器有以下几种方案。 [0004] At present, the high-pressure accumulator converter there are several options. 一种是采用两电平或三电平拓扑并将电力电子开关器件串联使用以产生更高的电压。 One is the use of a two-level or three-level topology and power electronic switching devices are used in series to generate higher voltages. 这种方案需要器件串联技术难度大、且对器件均一性要求高。 This solution requires a series of technical difficulties devices and device requirements of high uniformity. 另一种则使用H桥级联(CHB)的方法获得多电平高压输出。 Another use cascaded H-bridge (CHB) method for obtaining a multi-level high voltage output. 该方案需要每个级联单元都包含一组储能介质,通常需要对各单元进行荷电状态(SOC)以及充放电功率的均衡控制以便充分利用所有电池的存储能力以及延长其使用寿命。 The program requires that each cell contains a set of cascading energy storage media, usually it requires the state of charge (SOC) of each cell and the charge-discharge power balance control to fully utilize all the storage capacity of the battery and extend its life. 为降低对电池的绝缘要求和增强电池的安全性,通常需要在输出端加装隔离变压器,这增加了系统的体积、重量及造价。 To reduce the insulation requirements on the battery and enhancing safety of the battery, usually it requires the installation of an isolation transformer at the output, which increases the volume, weight and cost of the system. 也可以在每个单元内部将电池组通过隔离式DC/DC变换器接入逆变H桥,但是本方式使用开关器件数量大,能量转换环节多效率低。 Within each cell may be the H-bridge inverter battery access by isolated DC / DC converter, but the large number of switching devices according to the present embodiment, the energy conversion efficiency of a multi-part low.

[0005] 模块化多电平(MMC)是近年来出现的又一种可以输出多电平高电压无需升压变压器就可并网的拓扑结构。 [0005] The modular multi-level (MMC) in recent years is yet another multi-level may be output without a high voltage transformer can boost topology and network. 当模块单元使用半桥结构时,MMC可实现电能的交/直变换。 When using the half-bridge module unit, MMC achievable power AC / DC conversion. 中国专利CN102013691A在电池储能系统中采用了该拓扑结构。 Chinese Patent CN102013691A topology using the battery energy storage system. 由于多个储能电池组分散安放于不同模块单元中,所以需要对各电池组的荷电状态进行复杂的均衡控制,且大量电池分散安置使其防护、维护及更换较为不便。 Since a plurality of dispersed storage battery modules positioned in different units, it is necessary for the state of charge of each battery equalization control complex, and so a lot of battery protection dispersed placement, maintenance and replacement is inconvenient. 另外每个模块单元因含有电池,使模块体积和重量较大,增加了模块装配的难度。 In addition, each modular unit for containing the battery, so that a large module size and weight, increasing the difficulty of assembly of the module.

发明内容 SUMMARY

[0006] 本发明的目的在于克服已有的中高压多电平储能变流器的不足,降低现有方案的控制复杂度、提高转换效率和增强绝缘安全,提出一种使用模块化多电平交交变换拓扑的中压电池储能系统。 [0006] The object of the present invention to overcome the shortcomings of the existing high-pressure accumulator multilevel converter, to reduce the complexity of existing control schemes to improve conversion efficiency and enhanced safety insulation, to provide a modular multi-use medium-voltage level-AC conversion topology battery energy storage system.

[0007] 本发明电池储能系统所采用的技术方案是:本发明包括模块化多电平三相AC/单相AC变换器、单相高频隔离变压器、单相整流器和储能电池组。 Technical Solution battery energy storage system [0007] according to the present invention is that: the present invention comprises a modular multi-level three-phase AC / AC converter single-phase, single-phase high frequency isolation transformer, single-phase rectifier and an energy storage battery.

[0008] 网侧三相交流电连接到模块化多电平三相AC/单相AC变换器的三相输入侧,经该模块化多电平三相AC/单相AC变换器变换后,在所述模块化多电平三相AC/单相AC变换器的单相输出侧产生中高频单相交流电。 After the [0008] three-phase ac network side connected to the multi-level modular three-phase AC / AC converter of single-phase three-phase input side, through which the multi-level modular three-phase AC / AC converter converting a single-phase, in single-phase output side of the modular multi-level three-phase AC / AC converter of single-phase single-phase AC power generated in the high frequency. 该单相交流通过单相高频隔离变压器进行电气隔离,并将电能传递到变压器副边,变压器副边连接单相整流器的交流侧,单相整流器的直流侧连接储能电池组。 The single-phase single-phase AC by the high frequency isolation transformer electrical isolation, and the power transmitted to the secondary side of the transformer, the secondary side of the transformer connected to the AC single-phase rectifier, a DC-side single-phase rectifier is connected to the storage battery.

[0009] 所述模块化多电平三相AC/单相AC变换器的三相输入侧通过启动电路与电网相连,模块化多电平三相AC/单相AC变换器的单相输出侧连接于单相高频隔离变压器的原边。 [0009] The modular multi-level three-phase AC / AC converter of single-phase three-phase input side is connected to the starting circuit through the grid, modular multi-level three-phase AC / AC converter of the single-phase single-phase output side connected to a single-phase high frequency isolation transformer primary.

[0010] 所述模块化多电平三相AC/单相AC变换器由三相六个桥臂构成,每相包含上下两个桥臂。 [0010] The modular multi-level three-phase AC / AC converter is constituted by a single-phase three-phase six-arm, each phase comprises two upper and lower arm. 每个桥臂由N个模块单元和I个电抗器串联而成,N为大于I的自然数。 Each arm module units in series and I N chokes formed, N being a natural number greater than I. 每相的上桥臂和下桥臂连接在一起,连接点为三相交流输入端之一。 Phase upper arm and a lower arm each are connected together, the connection point of one of the three-phase AC input. 每个上桥臂的两个端点中:一个端点连接下桥臂,另一个端点与其他上桥臂的端点连接在一起形成一个输出端;每个下桥臂的两个端点中:一个端点连接上桥臂,另一个端点与其他下桥臂的端点连接在一起形成另一个输出端。 Two endpoints of each upper arm of: connecting a lower end arm, the other end connected to the other end of the upper arm together to form an output terminal; two endpoints of each lower arm of: a connection endpoint the upper arm, the other end with the other end of the lower arm are connected together to form another output terminal. 上述两个输出端分别作为模块化多电平三相AC/单相AC变换器的单相交流输出的两极。 It said two output terminals, respectively, as multi-level modular three-phase AC / AC converter of the single-phase single-phase AC output poles.

[0011] 所述模块化多电平三相AC/单相AC变换器通过控制桥臂电压实现三相交流到单相交流的转换。 [0011] The modular multi-level three-phase AC / AC converter to achieve a single-phase three-phase AC to convert single-phase AC voltage by the control arm. 桥臂电压由桥臂上串联的各个模块的输出电压叠加而成。 The output voltage of each module from the voltage of the series arm bridge arm superposition. 所述的模块单元由一个H桥(全桥)电路与直流电容并联而成,可输出双极性电压。 The module unit consists of a H-bridge (full-bridge) parallel connection circuit and the DC capacitor, a bipolar output voltage.

[0012] 单相高频隔离变压器的原边与模块化多电平三相AC/单相AC变换器的单相交流侧相连。 Primary and modularity [0012] Single-phase high frequency isolation transformer is single-phase AC side of the multi-level three-phase AC / AC converter is connected to a single phase. 单相高频隔离变压器的副边可以为一个或多个绕组,每个绕组连接一个单相整流器。 Single-phase high frequency isolation transformer secondary side may be one or more windings, each connected to a single-phase rectifier.

[0013] 所述单相整流器连接到单相高频隔离变压器的副边。 [0013] The single-phase single-phase rectifier connected to the secondary side of a high frequency isolation transformer. 单相整流器将输入的交流电转换为直流电,再输出到储能电池组。 Single-phase rectifier AC input into DC, and then output to the storage battery. 单相整流器可以由一个使用自关断电力电子器件的H桥(全桥)与直流电容并联而成,也可以由一个使用自关断电力电子器件的半桥电路与直流电容并联而成,还可以采用其他形式的单相整流器拓扑。 Single-phase rectifier may be used by an H-bridge (full-bridge) from the turn-off of power electronics and DC capacitor parallel connection, use may be made of a half-bridge circuit in parallel with the self turn-off of power electronics and DC capacitor is made, further It may take other forms of single-phase rectifier topology.

[0014] 单相高频隔离变压器通常有一个原边绕组,一个或为多个副边绕组,每个副边绕组连接一个单相整流器。 [0014] Single-phase high frequency isolation transformer usually has a primary winding, one or a plurality of secondary windings, each secondary winding connected to a single-phase rectifier.

[0015] 所述储能电池组并联在每个单相整流器的直流侧。 Each single-phase DC side of the rectifier [0015] In the storage battery in parallel. 储能电池组由一定数量的电池单体串联而成以得到所需的直流电压。 Storage battery in series from a number of battery cells to obtain the required DC voltage. 还可以将多个电池组并联以增大储能系统的功率和容量。 A plurality of battery packs may be further connected in parallel to increase the power and capacity of the energy storage system.

[0016] 所述启动电路由电阻和开关并联而成,将电网与模块化多电平三相AC/单相AC变换器的三相输入端连接在一起。 [0016] The starting circuit of a resistor and a switch connected in parallel from the grid and the multilevel modular three-phase AC / AC converter of single-phase three-phase input terminals are connected together.

[0017] 本发明的优点是: [0017] The advantage of the present invention are:

[0018] 本储能变流器系统使用集中式低压电池组无需多电池组均衡控制;使用体积小、重量小、成本较低的一台单相高频隔离变压器实现电网与电池的电气隔离;能量转换环节少系统效率高。 [0018] The present accumulator converter system using low-voltage battery without a centralized multi-cell balance control; the use of small size, low weight, low cost of a single-phase high frequency isolation transformer electrically isolate the grid and the battery; link high energy conversion system less efficient.

附图说明 BRIEF DESCRIPTION

[0019] 图1为本发明的结构示意图; [0019] FIG. 1 is a schematic view of the structure of the present invention;

[0020] 图2为模块化多电平三相AC/单相AC变换器的一个模块单元的结构示意图; [0020] FIG. 2 is a schematic view of a modular unit of the modular AC converter multi-level three-phase AC / single phase;

[0021] 图3为模块化多电平三相AC/单相AC变换器的电压关系示意图;[0022] 图4为单相整流器实施例的结构图。 [0021] FIG. 3 is a schematic diagram of a three-phase AC voltage relationship / single-phase AC converter modular multilevel; [0022] FIG. 4 is a block diagram of an embodiment of the single-phase rectifier.

具体实施方式 Detailed ways

[0023] 下面结合附图和具体实施方式进一步说明本发明。 [0023] The present invention is further explained below in conjunction with the accompanying drawings and specific embodiments.

[0024] 图1为本发明基于模块化多电平交交变换器的电池储能系统的结构图。 [0024] FIG. 1 configuration diagram based on modular multilevel AC-AC converter of the battery energy storage system of the present invention. 如图1所示,所述的储能系统由模块化多电平三相AC/单相AC变换器1、单相高频隔离变压器2、单相整流器3和储能电池组4组成。 1, the energy storage system by a modular multi-level three-phase AC / AC converter a single-phase, single-phase high frequency isolation transformer 2, a rectifier 3 and the single-phase energy storage battery pack 4 components. 模块化多电平三相AC/单相AC变换器I通过并网电感5和启动电路6连接到电网,并网电感5和启动电路6串联连接在模块化多电平三相AC/单相AC变换器I和电网之间。 Modular multi-level three-phase AC / I converter single-phase AC power grid connected to the network through the inductor 5 and 6 and the starting circuit, the inductor 5 and the grid startup circuit 6 is connected in series modular multi-level three-phase AC / single phase AC converter between the I and the power grid. 网侧三相交流电连接到模块化多电平三相AC/单相AC变换器I的三相输入侧,模块化多电平三相AC/单相AC变换器I将电网的工频三相电转换为高频单相电,模块化多电平三相AC/单相AC变换器I的单相交流输出端连接单相高频隔离变压器2的原边,单相高频隔离变压器2的副边连接单相整流器3的交流侧,单相整流器3的直流侧连接储能电池组4。 Three-phase ac network side connected to the multi-level modular three-phase three-phase input AC / I converter single-phase AC side of the multi-level modular three-phase AC / AC converter single-phase I the three-phase power grid frequency electricity into high frequency single phase, single-phase AC output of multi-level modular three-phase AC / AC converter single-phase single-phase I is connected to a high frequency isolation transformer primary side 2, a single-phase high frequency isolation transformer 2 AC single-phase rectifier connected to the secondary side 3 of the single-phase converter DC side connector 3 of the storage battery 4.

[0025] 模块化多电平三相AC/单相AC变换器I将电网的三相工频交流电转换为频率较高的单相交流电。 [0025] The modular multi-level three-phase AC / I converter single-phase AC power to three-phase industrial frequency alternating current is converted to a higher frequency single-phase AC power. 生成该单相交流电是为了利用单相高频隔离变压器2将网侧高压进行电气隔离后再对储能电池组4充电。 The generated single-phase AC power is then electrically isolated from 4 to charge the storage battery pack with a single-phase high frequency isolation transformer high-voltage side of the mesh 2. 模块化多电平三相AC/单相AC拓扑由三相六个桥臂构成,每相包含上下两个桥臂;每相的上、下桥臂的公共点连接三相电网电压之一相;各个上桥臂的两个端点中除去连接下桥臂的端点外剩余的另一个端点均连接在一起,形成一个输出端;各个下桥臂的两个端点中除去连接上桥臂的端点外剩余的另一个端点均连接在一起形成另一个输出端,上述的两个输出端分别作为模块化多电平三相AC/单相AC变换器I的单相交流输出的两极连接到单相高频隔离变压器2的原边。 Modular multi-level three-phase AC / AC single-phase bridge topology as a three phase six arms, each phase arm comprises upper and lower two; each phase, the common point of the arm is connected with one of the grid voltage, ; two end points of each upper arm removing an outer end connected to the other end of the remainder of the lower arm are connected together to form an output terminal; a connector on removal of two end points of each lower arm in the outer end of the arm the remaining other end are connected together to form another output terminal, two output terminals, respectively, as the above-described multi-level modular three-phase AC / AC converter of single-phase two-pole connection of the I-phase single-phase AC output to a single high primary frequency isolation transformer 2.

[0026] 每个桥臂如图1所示由N个模块单元以及一个电抗器串联而成,N为大于I的自然数。 [0026] As shown in each arm of N modules are connected in series and a reactor unit 1, N is a natural number greater than I. 电抗器可以减少环流,并限制网侧短路故障时的电流。 Loop reactor can be reduced, and the grid-side current limiting short-circuit failure. 模块单元的结构如图2所示:第一开关Tl与第一二极管Dl并联,第二开关T2与第二二极管D2并联,第三开关T3与第三二极管D3并联,第四开关T4与第四二极管D4并联;第一开关Tl与第二开关T2串联,第三开关T3与第四开关T4串联,串联在一起的第一开关Tl、第二开关T2与串联在一起的第三开关T3、第四开关T4并联形成H桥,串联在一起的第一开关Tl、第二开关T2同时与电容C并联。 A first switch and a first diode Dl in parallel Tl, T2 in parallel with the second diode D2, the third switch T3 of the second switch and the third diode D3 connected in parallel, of: structural module unit shown in FIG. 2 four switch T4 and the fourth diode D4 in parallel; first switches Tl and T2 in series a second switch, the third switch T3 and the fourth switch T4 in series, a first switch Tl connected together in series, in series with a second switch T2 together with the third switch T3, T4 in parallel to the fourth switch H-bridge is formed, a first switch connected in series with Tl and T2 while the second switch and the capacitor C in parallel. H桥两个桥臂的中点为模块单元的两个输出端,输出的电压为双极性:当开关器件Tl、T4导通而T2、T3关断时,模块单元输出正电压;当开关器件Tl、T4关断而T2、T3导通时,模块单元输出负电压。 Midpoint of the two arms of the bridge to two outputs of the H-bridge module unit, a bipolar voltage output: When the switching devices Tl, T4 is turned on and T2, the time T3 is turned off, a positive output voltage of the module unit; when the switch devices Tl, T4 is turned off and T2, the time T3 is turned on, the module unit outputs a negative voltage. 通过控制各个模块单元的输出电压可控制各个桥臂电压,进而实现三相交流到单相交流的转换。 By controlling the output voltage of each module unit may control the voltage of each bridge arm, so as to realize single-phase to three-phase AC conversion. 以桥臂为基本单元进行电路的分析如图3所示。 Analysis bridge arm circuit as a basic unit shown in Figure 3. 设A、B、C三相上下桥臂的电压分别为Vap、Van, Vbp, Vbn, Vcp, Vcn,输入的三相交流电压为Va、\、V。 Set A, B, C phase voltage upper and lower arms are Vap, three-phase AC voltage Van, Vbp, Vbn, Vcp, Vcn, input is Va, \, V. ,输出的单相交流电压为\。 , Single-phase AC voltage output is \. 经电路理论推导可知,桥臂电压满足以下条件可得到上述的输入侧三相交流电压和输出侧单相交流电压: It understood by theoretical derivation circuit, a voltage arm the following conditions are obtained in the above-described three-phase AC voltage input side and output-side AC voltage:

Figure CN103236706AD00061

[0028] 模块单元中还包含有旁路开关K1,旁路开关Kl并联于模块单元的输出端,如图2所示。 [0028] The modular unit further comprises a bypass switch K1, the output of the bypass switch in parallel with Kl module unit, as shown in FIG. 模块单元发生故障时,旁路开关Ki闭合,使得发生故障的模块单元被切除。 When the module unit fails, Ki bypass switch is closed, so that the module failed unit is removed. 通常还可增加冗余模块单元,在备用状态下冗余单元的旁路开关为闭合状态。 Also generally increases the redundancy module unit, the bypass switch in the redundant units in the standby state to the closed state. 当同一相的其他模块单元发生故障时,旁路开关打开,将冗余单元投入运行。 When the same phase in other modules unit fails, the bypass switch is opened, the redundant cells into operation.

[0029] 单相高频隔离变压器2的原边绕组连接模块化多电平三相AC/单相AC变换器I的单相交流侧。 [0029] Single-phase high frequency isolation transformer primary winding 2 is connected to modular multi-level single-phase AC side of the three-phase AC / I is a single-phase AC converter. 单相高频隔离变压器2的副边绕组连接单相整流器3的交流侧。 Single-phase high frequency isolation transformer secondary winding 2 is connected to the AC side of the single-phase rectifier 3. 单相高频隔离变压器2通常有一个原边绕组,一个或为多个副边绕组,每个副边绕组连接一个单相整流器。 2 Single-phase high frequency isolation transformer is usually a primary winding, one or a plurality of secondary windings, each secondary winding connected to a single-phase rectifier. 原边绕组和所有副边绕组共用一个铁芯。 Primary winding and secondary winding all share a common core. 单相高频隔离变压器2工作于中高频,以便减小系统的体积、重量和降低造价。 Single-phase high frequency isolation transformer 2 is operated in a high frequency in order to reduce system size, weight and lower cost.

[0030] 单相整流器3负责将隔离后的单相交流电转换为电池所需的直流电。 [0030] After the single-phase rectifier 3 is responsible for isolating the desired single-phase AC electricity into DC battery. 单相整流器 Single-phase rectifier

3的一种结构是单相全桥PWM整流器,如图4所示:四个电力电子开关器件T5-T8分别并联二极管D5-D8后构成了H桥。 3 is a configuration of a single-phase full-bridge PWM converter shown in Figure 4: four power electronic switching devices T5-T8 are connected in parallel diodes D5-D8 constitute the H-bridge. H桥的交流侧连接单相高频隔离变压器的一组副边,储能电池组4并联在H桥的直流侧。 H-bridge connected to the AC side of the single-phase high frequency isolation transformer secondary side of a set, the storage battery 4 in parallel to the DC side of the H-bridge. H桥的交流输出电压为双极性,当第五开关T5和第八开关T8导通,而第六开关T6和第七开关T7关断时,单相全桥PWM整流器输出正电压,当第五开关T5和第八开关T8关断,而第六开关T6和第七开关T7导通时,单相全桥PWM整流器输出负电压。 H-bridge AC output voltage is bipolar, when the fifth switch and the eighth switch T8 T5 is turned on, the sixth switch and the seventh switch T6 and T7 is OFF, the single-phase PWM full bridge rectifier output voltage is positive, when the first fifth switch T5 T8 is turned off and the eighth switch, the sixth switch and the seventh switch T6 and T7 is turned on, single-phase full-bridge PWM rectifier negative output voltage. 控制H桥输出电压的相位和幅值,可控制储能电池组4充电以及放电的功率。 Controlling the phase and amplitude of the H-bridge output voltage, the storage battery 4 can be controlled charging and discharging power.

[0031] 储能电池组4并联于单相整流器3的直流侧。 [0031] The storage battery 4 in parallel with the single-phase DC converter 3 side. 为得到适应单相整流器3的直流电压,储能电池组4可以由多个电池单体串联而成。 To obtain a single-phase converter DC voltage to adapt to 3, storage battery 4 may be formed by a plurality of battery cells connected in series. 为适应充放电的功率需求以及增大存储容量,储能电池组4还可以由多组串联电池组并联而成。 To meet the power demand and increasing the charge and discharge of the storage capacity, the storage battery 4 may also be made in parallel by a plurality of battery packs in series.

Claims (7)

  1. 1.一种基于模块化多电平交交变换拓扑的电池储能系统,其特征在于:所述的储能系统由模块化多电平三相AC/单相AC变换器(I)、单相高频隔离变压器(2)、单相整流器(3)、储能电池组(4)组成;模块化多电平三相AC/单相AC变换器(I)通过并网电感(5 )和启动电路(6)连接到电网,网侧三相交流电送入模块化多电平三相AC/单相AC变换器(I)的三相输入侧,模块化多电平三相AC/单相AC变换器(I)将电网的工频三相电转换为高频单相电,该单相交流电连接到单相高频隔离变压器(2)的原边;单相高频隔离变压器(2)的副边连接单相整流器(3),单相整流器(3)的直流侧连接储能电池组(4)。 1. A modular multi-level conversion topology cycloconverter based on battery energy storage system, wherein: said energy storage system by a modular multi-level three-phase AC / AC converter single-phase (the I), single-phase high frequency isolation transformer (2), single-phase rectifier (3), the storage battery (4) consisting of; modular multi-level three-phase AC / AC converter single-phase (I) by grid inductor (5) and start circuit (6) connected to the three-phase network, three-phase AC network side into a modular multi-level three-phase AC / AC converter single-phase (I) input side, modular multi-level three-phase AC / AC single phase converter (I) the frequency of the three-phase power into high frequency power single phase, single-phase AC which is electrically connected to the original single-phase high frequency isolation transformer (2) side; single-phase high frequency isolation transformer (2) single-phase rectifier connected to the secondary side (3), single-phase rectifier (3) connected to a DC side of an energy storage battery (4).
  2. 2.根据权利要求1所述的电池储能系统,其特征在于:所述的模块化多电平三相AC/单相AC变换器(I)由三相六个桥臂构成,每相包含上下两个桥臂,每个桥臂由N个模块单元以及一个电抗器串联而成,N为大于I的自然数;每相的上桥臂和下桥臂连接在一起,连接点为三相交流输入端之一;每个上桥臂的两个端点中:一个端点连接下桥臂,另一个端点与其他上桥臂的端点连接在一起形成一个输出端;每个下桥臂的两个端点中:一个端点连接上桥臂,另一个端点与其他下桥臂的端点连接在一起形成另一个输出端;上述两个输出端分别作为模块化多电平三相AC/单相AC变换器的单相交流输出的两极。 The battery energy storage system according to claim 1, wherein: the multi-level modular three-phase AC / AC converter single-phase (I) consists of six three-phase bridge arm, each phase comprising upper and lower two bridge arms, each arm consisting of N modules in series and a reactor unit together, N is a natural number greater than I; each phase upper arm and lower arm are connected together, the connection point for the three-phase AC one input terminal; two endpoints of each upper arm of: connecting a lower end arm, the other end connected to the other end of the arm together to form an output terminal; two endpoints of each of the lower arm : one end connected to the upper arm, the other end connected to the other end of the lower arm together to form the other output terminal; and the two output terminals are multi-level modular three-phase AC / AC converter of a single-phase bipolar single-phase AC output.
  3. 3.根据权利要求1所述的电池储能系统,其特征在于:所述的模块单元中,四个电力电子开关器件(T1-T4)分别与四个并联二极管(D1-D4)构成H桥:第一开关(Tl)与第一二极管(Dl)并联,第二开关(T2)与第二二极管(D2)并联,第三开关(T3)与第三二极管(D3)并联,第四开关(T4)与第四二极管(D4)并联;第一开关(Tl)与第二开关(T2)串联,第三开关(T3)与第四开关(T4)串联,串联在一起的第一开关(Tl)、第二开关(T2)与串联在一起的第三开关(T3)、第四开关(T4)并联,串联在一起的第一开关(Tl)、第二开关(T2)同时与电容(C)并联;H桥两个桥臂的中点为所述模块单元的两个输出端,输出的电压为双极性:当第一开关(Tl)和第四开关(T4)导通而第二开关(T2)和第三开关(T3)关断时,所述的模块单元输出正电压;当第一开关器件(Tl)和第四开关(T4)关断而第二开关(T2)、第三开关(T3)导通时,所述的模块单 The battery energy storage system according to claim 1, wherein: said modular units, four power electronic switching devices (T1-T4) are connected in parallel and four diodes (D1-D4) constituting the H-bridge : a first switch (Tl) (Dl) parallel to the first diode, the second switch (T2) and a second diode (D2) connected in parallel, the third switch (T3) and the third diode (D3) in parallel, a fourth switch (T4) and the fourth diode (D4) connected in parallel; a first switch (Tl) and the second switch (T2) connected in series, the third switch (T3) and the fourth switch (T4) connected in series, the series together with the first switch (Tl), a second switch (T2) a third switch (T3) and connected together in series, the fourth switch (T4) connected in parallel, a first switch connected in series with the (Tl), a second switch (T2) while the capacitor (C) connected in parallel; H midpoint of the two bridge arms of said bridge module means two output terminals, the output voltage is bipolar: when the first switch (Tl) and the fourth switch (T4) is turned on and the second switch (T2) and the third switch (T3) is turned off when a positive voltage is outputted modular unit; when the first switch device (Tl) and the fourth switch (T4) is turned off and the second switch (T2), a third switch (T3) is turned on, the single module 输出负电压;通过控制各个模块单元的输出电压控制各个桥臂电压,实现三相交流到单相交流的转换。 A negative output voltage; by each module control unit controls the output voltage of the voltage of each arm, to achieve the single-phase three-phase AC conversion.
  4. 4.根据权利要求1所述的电池储能系统,其特征在于:所述单相高频隔离变压器(2)有一个原边绕组,一个或多个副边绕组,每个副边绕组连接一个单相整流器;所述的原边绕组和所有副边绕组共用一个铁芯。 The battery energy storage system according to claim 1, wherein: said single-phase high frequency isolation transformer (2) having a primary winding, the one or more secondary windings, each connected to a secondary winding single-phase rectifier; the primary winding and secondary winding all share a common core.
  5. 5.根据权利要求1所述的电池储能系统,其特征在于:所述的单相整流器(3)是单相全桥PWM整流器,H桥的交流输出电压为双极性,当第五开关(T5)和第八开关(T8)导通而第六开关(T6)和第七开关(T7)关断时,单相全桥PWM整流器输出正电压;当第五开关(T5)和第八开关(T8)关断,而第六开关(T6)和第七开关(T7)导通时,单相全桥PWM整流器输出负电压;控制H桥输出电压的相位和幅值控制储能电池组(4)充电以及放电的功率。 5. The battery energy storage system according to claim 1, wherein: said single-phase rectifiers (3) is a single-phase full-bridge PWM converter, the AC output voltage of the H-bridge bipolar, when the fifth switch (T5) and the eighth switch (T8) is turned on and the sixth switch (T6) and the seventh switch (T7) is oFF, the single-phase PWM rectifier positive output voltage of the full-bridge; when the fifth switch (T5) and eighth switch (T8) is turned off, while the sixth switch (T6) and the seventh switch (T7) is turned on, single-phase full-bridge PWM rectifier negative output voltage; controlling the phase and amplitude of the H-bridge output control voltage energy storage battery (4) charge and discharge power.
  6. 6.根据权利要求1所述的电池储能系统,其特征在于:所述的储能电池组(4)由多个电池单体串联而成,或由多组串联电池组并联组成。 The battery energy storage system according to claim 1, wherein: said storage battery (4) by a plurality of battery cells connected in series together, in series or in parallel to the battery pack consisting of a plurality of sets.
  7. 7.根据权利要求1所述的电池储能系统,其特征在于:所述的启动电路(6)由电阻和开关并联组成;启动电路(6 )串联连接在模块化多电平三相AC/单相AC变换器(I)和电网之间。 The battery energy storage system according to claim 1, wherein: said starting circuit (6) of a resistor and a switch connected in parallel; starting circuit (6) connected in series modular multi-level three-phase AC / single-phase AC inverter (I) and between the grid.
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